N 6704 is a spring loaded, 3/4 in Dia nylon roller guide in a 3/8 in plastic base. It mounts on the top edge of a bi-fold door that is 1 to 1-3/8 in thick. Used by many bi-fold door manufacturers.
Spring-loaded plastic base
Spring-loaded plastic base
No fasteners required
Easy to install
3/4 in horizontal nylon roller mounted on a spring-loaded shaft in the plastic base